<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>
<body>
    <script>
      /*   var wang={
            name:"wangyu"
        }
        var cheng=function(){
            console.log(this.name);
        }.bind(wang);
        cheng(); */
    var cheng={
        name:"cheng"
    }
    var jiang={
        name:"jiang",
        sayName(a,b){
            console.log(this.name);
            console.log(a+b);
        }
    }
    // jiang.sayName.call(cheng,1,2);
     jiang.sayName.apply(cheng,[1,2])
    </script>
</body>
</html>